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Integrated Neutron Detector for Handheld Systems

Author:
Glodo, J.   Gueorguiev, A.   Shirwadkar, U.   Hawrami, R.   Tower, J.   O\"Dougherty, P.   Shah, K. S.  


Journal:
IEEE Transactions on Nuclear Science


Issue Date:
2013


Abstract(summary):

This paper describes detectors comprised of Cs2LiYCl6 : Ce(CLYC) scintillators coupled to silicon photomultipliers (MPPC, Hamamatsu). CLYC has been developed for dual gamma ray and thermal neutron detection. MPPCs are compact detectors with a very thin profile (similar to 2 mm), but also a small active area (6 mm x 6 mm). The combination of both can create a compact replacement of a He-3 tube. Three different crystal sizes were tested: a 5 mm x 5 mm x 5 mm cube, a 1 cm x 1 cm x 4 cm cuboid, and a empty set1 in x 1 in cylinder. All three detectors showed a well-resolved thermal neutron peak with energy resolution of 5.4%, 7%, and 11% (FWHM), respectively. The degradation in larger crystals is due to a mismatch between the coupled crystal face and the active area of the light detector. All detectors showed the 662 keV gamma ray peak from a Cs-137 source, indicating capability for limited gamma ray spectroscopy, with energy resolutions of 10%, 17%, and 26%, respectively. The capability for pulse shape discrimination was shown as well. The efficiency of the detectors was measured against a 10 atm He-3 tube (9 cm(3) volume). The best absolute efficiency was shown by the cylinder detector, next by the He-3 tube (almost the same as the cylinder detector), and finally by the cuboid detector. The latter showed the best neutron count per cm(3), twice as high as the two other detectors.


Page:
903-907


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